Add the OpenRouter catalog module

catalog.go

@@ -0,0 +1,19 @@
+// Package openrouter supplies immutable OpenRouter catalog assets for
+// Promptkit. It does not implement provider behavior or runtime configuration.
+package openrouter
+
+import (
+	"embed"
+	"io/fs"
+)
+
+// Root is the filesystem root containing this module's catalog assets.
+const Root = "catalog"
+
+//go:embed catalog
+var catalogFS embed.FS
+
+// FS returns the immutable embedded filesystem containing the catalog assets.
+func FS() fs.FS {
+	return catalogFS
+}